JPH02148246A - General use bus memory space allocating system for general use bus control adapter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a general-purpose bus control adapter that is connected to a general-purpose bus of a microcomputer system and controls connections with other computer systems. Bus memory space allocation is method-related.

(Prior Art) In recent years, each manufacturer's own computer system or device has been transferred to a general-purpose bus of a microcomputer system, such as IEE
E standard VM E (Versa ModuleEur
(ope) bus through a general-purpose bus control adapter (ADP) and its attached connection cable. When building such a system, if the ADP is allocated to a portion of the VME bus's memory space so that the ADP operates as a slave,
That is, when access is requested by other devices in the microcomputer system such as the system controller (SC), the memory space allocated above is used as a window to access the memory of other computer systems (manufacturer's own computer system). Access is possible. On the other hand, when ADP operates as a mask, that is, when there is an access request from another computer system, the allocated space becomes the memory of the requesting system, so the space cannot be accessed (meaningless). - is within the membrane.

In this way, in a system in which other computer systems are connected to the general-purpose bus (VME bus) of a microcomputer system via a general-purpose bus control adapter (ADP), a part of the memory space of the general-purpose bus is used as a kind of window to connect the microcomputer system to a general-purpose bus (VME bus). The memory, etc. of other computer systems can be accessed from the side via a general-purpose bus control adapter. For this purpose, the memory space portion of the other computer system to be accessed and the memory space portion (window) of the general-purpose bus allocated to the general-purpose bus control adapter are required.
It is necessary to have a one-to-one correspondence.

On the other hand, status information such as control information and operation information when accessing the memory of other computer systems is transferred to the VM.
In order to obtain over the E-bus, the allocation to the general-purpose bus control adapter must use a portion of the memory space. However, in this case, the memory space portion allocated to the general-purpose bus control adapter does not correspond one-to-one with the memory space portion of another computer system. For this reason, conventionally, the above-mentioned status information could not be obtained from the general-purpose bus. Furthermore, for the same reason, the general-purpose bus control adapter itself cannot check its own operation, especially the mask function, through the general-purpose bus.

(Problem to be Solved by the Invention) As described above, in a system in which another computer system is connected to a general-purpose bus of a microcomputer system via a general-purpose bus control adapter, conventionally, the general-purpose bus assigned to the general-purpose bus control adapter is By creating a one-to-one correspondence between the memory space of the computer and the memory space of another computer system that accesses this memory space as a kind of window, the general-purpose bus control adapter itself can access it via the general-purpose bus. This causes problems such as the general-purpose bus control adapter being unable to obtain status information (when accessing memory, etc. of other computer systems) via the general-purpose bus, or checking its own operation with the general-purpose bus control adapter alone. was there.

Therefore, the problem to be solved by this invention is to create a one-to-one correspondence between the memory space portion of the general-purpose bus assigned to the general-purpose bus control adapter and the memory space portion of another computer system connected to the general-purpose bus control adapter. The objective is to enable the general-purpose bus control adapter to obtain status information via the general-purpose bus when accessing another computer system, and to check its own operation through the general-purpose bus.

[Structure of the Invention] (Means for Solving the Problems) This invention forms part of the memory space of a general-purpose bus, and the memory space of another computer system connected to the general-purpose bus via a general-purpose bus control adapter. The first one, which corresponds one-on-one to some
A memory space and a second memory space, which forms another part of the memory space of the general-purpose bus and can specify several storage means including a status storage means in the general-purpose bus control adapter, are both controlled by the general-purpose bus control. The present invention is characterized in that the memory means allocated to the adapter and within the general-purpose bus control adapter is accessed by at least the adapter through the second memory space of the general-purpose bus.

(Function) According to the above configuration, a part of the memory space of another computer system and a part of the memory space of the general-purpose bus (first memory space) allocated as a window for accessing this part can be accessed. Even in a one-to-one correspondence state, a general-purpose bus control adapter etc. may store some storage means within the adapter.
Access is possible via the general-purpose bus through a second memory space, which is a spatial portion of the general-purpose bus's memory space that is different from the first memory space. Therefore, if the storage means to be accessed is a status storage means, status information when accessing memory for other computer systems can be obtained through a general-purpose bus, and if the storage means is readable/writable, this register means can be used as a general-purpose bus. By reading/writing through the bus, it becomes possible to check its own operation using only the general-purpose bus control adapter.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the state of memory allocation in a general-purpose bus (VME bus) memory space, and FIG. 2 is a block diagram of a system in which the memory allocation shown in FIG. 1 is performed.

In FIG. 1, 10 is a microcomputer system, and 11 is a bus (general-purpose bus) of the microcomputer system, for example, a VME bus. 12 is VME bus 11
A system controller (hereinafter referred to as SC) which is connected to the VME bus 11 and controls the system and has both mask and slave functions, and a VME bus controller 13 which is connected to the VME bus 11 and controls the connection with a computer system 20 to be described later. adapter (hereinafter referred to as ADP). ADP
13 is (part of) the memory space of another computer system 20
A status register (SR) 14 for holding information and status results (status information, etc.) when accessed through a memory space 41 (described later) in the V M E /< space 11, and a status register (SR) 14 for checking its own operation. It has a register group including a readable/writable test register (TR) 15 used for. 20 is a computer system similar to the microcomputer system 10 (the same system 10), 21 is the main memory of the computer system 2 (hereinafter referred to as MM), and 30 is the computer system 2
0 of the microcomputer system 10
This is a connection cable for connecting to 13.

Now, in the microcomputer system IO, as shown in FIG.
An arbitrary partial space (memory space) 4I (size N is bytes) of the E bus memory space) 40 is used to access the memory space (MM memory space) 50 of the other computer system 20 through the same space 41. A part (memory space) 51 (of the same size, N bytes) is allocated to the ADP 13 as a window for accessing it. In addition, for the register group including the status register 14 and test register 15 in the ADP IB, another part (memory space) 42 of the VME bus memory space 40 (with a size of M bytes) is used for this register group, etc. It is allocated as a window for reading/writing. In addition, another part of the VME bus memory space 40 (memory space) 43 is allocated to a memory (not shown) in the 5C12 as a window for accessing this memory.

Next, the operation of one embodiment of the present invention will be explained.

For example, 5C12 connected to the VME bus 11 of the microcomputer system IO has N (of the VME bus memory space 40) allocated to ADP 13.
By accessing the byte memory space 41, A
MM in other computer system 20 via D P 13
21 (out of the MM memory space 50) of N byte memory space 51 is accessed. That is, the 5C12 directly accesses the MM21 (MM memory space 50 of the other computer system 20) through the memory space 41 as a window.
The space 51) in the image will be visible.

Its range (range of memory space 41) is N bytes,
In the ADP 13, the pair corresponds to the space 51 of the MM memory space 50 as it is. The range of this memory space 41 is determined by the address setting switch provided on the ADP 13, for example, on the address old gh side, and the address 1. It is set by the address setting switch on the ov side.

Now, in the architecture of the VME bus 11, failure detection at the time of memory access is generally only provided by (on/off) of a VME bus error signal and a timeout by a timer on the accessing side. However, as shown in FIG. 2, in a system in which the ADP 13 and another computer system 20 are connected via the connection cable 30, a bus error (VME bus Even if the error signal turns on), it is not possible to obtain detailed information about where or what kind of error actually occurred.

Therefore, in this embodiment, the status register (SR) 15 and the like in the ADP 13 in which this kind of detailed information (status information) is stored is stored, for example, using the memory space 42 as a window, as shown in FIG. 5C12 can access it. This also improves maintainability. The range of the memory space 42 is the address setting switch on the old GH side (different from the address for setting the memory space 41) provided in the ADP 13, and the addresses 1 and 0.
It is set by the address setting switch on the ν side.

In addition to the 5C12, the memory space 42 is used for other computer systems 20, and even the ADP 13 itself.
1. Further, the other computer systems 20 and the ADP 13 can access the memory and the like in the 5C 12 using the space 43 in the VME bus memory space 40 as a window. For this reason, ADP
13 can check the operation of the master system by accessing the memory in the 5C 12 via the VME bus 11 using the memory space 43 as a window. However, in order to perform this confirmation, 5C12 as described above is required.
, etc., must be connected to the VME bus 11.

However, devices such as the 5C12 connected to the VME bus 11 are generally prepared by the user, except for the ADP 13, so the manufacturer side
It is extremely difficult to confirm the operation of .

However, in this embodiment, as described above, the other computer system 20 and the ADP 13 itself use the memory space 42 as a window to read the test register (
TR) etc. can be accessed via the VME bus 11. Therefore, the other computer system 20 acts as a mask to
The memory space allocated to P13 (separate from the memory space 41 for accessing MM21) is made accessible, and ADP13 uses test register 15 as VM.
By reading/writing via the E bus 11, the ADP
You can easily conduct your own operation confirmation test using only 13. In this case, the ADP 13 also includes a function as a system controller (SC).

[Effects of the Invention] As detailed above, according to the present invention, a part of the memory space of another computer system and the memory of the general-purpose bus allocated to the general-purpose bus control adapter as a window for accessing this part. Even if there is a one-to-one correspondence between a part of the space (the first memory space), a general-purpose bus control adapter, etc. may store some storage means in the adapter in the first memory space of the memory space of the general-purpose bus. Since the second memory space, which is a different space from the 2nd memory space, can be accessed as a window via a general-purpose bus, if the storage means to be accessed is a status storage means, detailed status information when accessing memory for other computer systems can be accessed as a general-purpose bus. If the register means can be obtained through the bus and is readable/writable, by reading/writing the register means through the general-purpose bus, it becomes possible to check its own operation using only the general-purpose bus control adapter.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of memory allocation in a general-purpose bus memory space directly related to the present invention, and FIG.
1 is a block configuration diagram showing an example of a system in which the memory allocation shown in the figure is performed; FIG. 10... Microcomputer system, 11...
General-purpose bus (VME bus), 12-system controller (SC), 13-VME bus control adapter 9 (
ADP. general-purpose bus control adapter), 14...Status register (SR), 15...Test register (TR), 20
... (other) computer systems, 21 ... main memory (M
M), 40...VME bus memory space, 41...(
1st) memory space, 42... (2nd) memory space, 5
0...MM memory space. Applicant's Representative Patent Attorney Takehiko Suzue

Claims (1)

[Scope of Claims] Several status storage means connected to a general-purpose bus of a microcomputer system to control connections with other computer systems, and indicating various statuses when accessing memory to the other computer systems, etc. A general-purpose bus control adapter having a storage means includes a first memory space that forms part of the memory space of the general-purpose bus and corresponds one-to-one to a part of the memory space of the other computer system, and a second memory space forming another part of the memory space and capable of specifying the several storage means in the general-purpose bus control adapter; A general-purpose bus memory space allocation method in a general-purpose bus control adapter, characterized in that access is made through the second memory space of the general-purpose bus.